Dab tsi yog txoj hauv kev ua haujlwm ntawm daim ntawv extrusion ntau lawm?

1. Cov khoom siv raw:
Kev pub mis: Ntxiv cov khoom siv raw xws li cov khoom yas rau hauv lub hopper ntawm extruder. Lub hopper plays lub luag haujlwm ntawm kev khaws cia thiab pib xa cov khoom siv raw. Feem ntau, lub peev xwm tsim nyog yog tsim raws li qhov kev ceev thiab kev thov ntawm cov kab ntau lawm kom ntseeg tau tias kev tsim khoom tas mus li.
Kev ziab (rau cov khoom siv tshwj xeeb): Rau qee cov khoom siv yas uas yooj yim nqus dej, xws li nylon, polycarbonate, thiab lwm yam, lawv yuav tsum tau qhuav ua ntej. Lub tshuab ziab khaub ncaws tshem tawm cov dej noo los ntawm cov khoom siv raw los ntawm cov cua kub ncig lossis lub tshuab nqus tsev, vim tias qhov muaj cov dej noo yuav ua rau muaj qhov tsis xws li npuas thiab nyiaj nyob ntawm cov khoom thaum lub sij hawm extrusion txheej txheem, cuam tshuam rau qhov zoo ntawm daim ntawv.
2. Extrusion txheej txheem:
Plasticization: Cov khoom siv raw nkag mus rau hauv lub thoob ntawm lub extruder los ntawm lub hopper, thiab cov ntsia hlau ntawm extruder pib tig nyob rau hauv lub tsav ntawm lub cev muaj zog. Qhov saum npoo ntawm cov ntsia hlau muaj cov qauv xov tshwj xeeb. Thaum lub sij hawm kev sib hloov, kev sib txhuam thiab shearing yog generated ntawm lub puab phab ntsa ntawm lub thoob thiab cov khoom raw. Nyob rau tib lub sijhawm, cov cuab yeej siv cua sov feem ntau yog muab rau sab nraud ntawm lub thoob, xws li cov cua sov los yog cov cua sov induction, kom qhov kub ntawm lub thoob. Raws li kev sib xyaw ua ke ntawm kev sib txhuam, shear quab yuam thiab cua sov, cov khoom yas maj mam hloov los ntawm cov khoom hauv lub xeev mus rau lub xeev molten kom ua tiav plasticization.
Kev thauj mus los: Raws li cov ntsia hlau tig tsis tu ncua, cov yas yas yaj yog thawb mus rau pem hauv ntej kawg ntawm cov ntsia hlau (piv txwv li, cov kev taw qhia extrusion). Cov ntsia hlau xov qhov tob thiab suab thiab lwm yam tsis yog tsim los xyuas kom meej tias cov yas yaj yog thauj mus rau pem hauv ntej ntawm ib qho kev sib tw ceev thiab siab hauv lub thoob.
Lim (optional): Yuav kom tshem tawm cov impurities thiab tsis tiav cov khoom yas hauv cov yas yaj, cov lim los yog cov tshuaj ntsuam hloov feem ntau yog ntsia ntawm qhov kawg ntawm qhov extruder. Cov yas lim dej yaj yog purer, uas pab txhim kho cov ntawv zoo.
Metering (yeem): Qee cov ntawv extrusion ntau lawm kab yuav nruab ib lub twj tso kua mis ntsuas ntawm lub extruder thiab tuag. Lub metering twj tso kua mis muaj peev xwm pressurize thiab stabilize cov yas yaj, thiab muaj peev xwm tswj tau qhov tso zis ntws ntawm cov yaj los xyuas kom meej lub thickness thiab qhov tseeb ntawm daim ntawv.
3. Moulding txheej txheem:
Extrusion tuag molding: Cov yas yaj tom qab plasticization, conveying thiab pom (los yog metering) nkag mus rau extrusion tuag. Lub extrusion tuag yog ib qho tseem ceeb ntawm cov ntawv extrusion ntau lawm kab. Cov qauv tsim thiab cov duab ntawm nws cov channel ntws sab hauv txiav txim siab cov duab, thickness thiab dav ntawm daim ntawv. Nyob rau hauv lub siab nyob rau hauv lub tuag, cov yas yaj yog extruded los ntawm lub qhov hluav taws xob ntawm cov tuag los ua ib tug nruam daim ntawv qauv.
4. Cov txheej txheem tom qab ua tiav:
Txias thiab shaping: Cov ntawv extruded los ntawm extrusion tuag muaj qhov kub thiab txias, yog li nws yuav tsum tau txias thiab zoo li tus. Cov cuab yeej ua kom txias feem ntau yog siv cov dej txias los yog cua txias kom ceev cov ntawv, kom cov yas yaj tuaj yeem ua kom ruaj khov thiab tswj cov duab thiab qhov loj me. Qhov ceev thiab qhov sib xws ntawm qhov txias txias muaj qhov cuam tshuam tseem ceeb ntawm cov ntawv zoo. Yog tias qhov txias txias nrawm dhau los yog tsis sib xws, nws yuav ua rau muaj kev ntxhov siab sab hauv, warping thiab lwm yam teeb meem hauv daim ntawv.
Trimming: Tom qab txias thiab shaping, cov npoo ntawm daim ntawv yuav tsis zoo txaus. Nws yog ib qho tsim nyog yuav tsum tau kho ob sab ntawm daim ntawv los ntawm cov txheej txheem trimming kom tshem tawm cov khoom seem kom cov npoo ntawm daim ntawv zoo huv si thiab qhov loj me raws li qhov yuav tsum tau ua.
Traction: Cov cuab yeej traction rub daim ntawv rau pem hauv ntej los ntawm extrusion tuag los ntawm kev sib txhuam los yog clamping quab yuam kom ntseeg tau tias cov ntawv txuas ntxiv. Kev rub ceev yuav tsum ua kom haum rau qhov nrawm nrawm kom ntseeg tau tias qhov kev sib tw thiab cov thickness uniformity ntawm daim ntawv.
Winding los yog txiav: Raws li kev tsim khoom, daim ntawv tuaj yeem raug mob rau hauv yob los ntawm cov khoom siv winding kom yooj yim khaws cia thiab kev thauj mus los; los yog daim ntawv tuaj yeem txiav mus rau hauv ib qho ntev los ntawm cov cuab yeej txiav rau kev ua haujlwm tom ntej thiab siv.